Datasheet

EVAL-ADP2114
Rev. 0 | Page 4 of 20
Test Poi nt PGOOD1 or Test Poi nt PGOOD2 to monitor whether
the converter output voltage, V
OUT
, is within regulation.
EVALUATING PERFORMANCE OF THE DC-TO-DC
CONVERTER
Switching Waveforms
To observe the switching waveform with an oscilloscope, place
the probe tip at the end of Inductor L1 (or L2 for Channel 2)
that is connected to the SWx pin of the ADP2114. The probe
ground is connected to GND.
Output Voltage Ripple
To observe the output voltage ripple, place the oscilloscope
probe tip at Terminal T3 (or T6 for Channel 2), the converter
output, and connect the probe ground lead to Terminal T7
(GND). The oscilloscope input should be set to ac-coupled.
Measuring Efficiency
The efficiency, η, is calculated by comparing the measured
input power with the measured output power of the converter:
ININ
OUTOUT
IV
IV
×
×
=η
(2)
Measuring Line Regulation
Vary the input voltage and measure the change of the output
voltage.
Measuring Load Regulation
Measure the load regulation by increasing the load current at
the output and measuring the change in output voltage.
Line Transient Response
Generate a step input voltage (V
IN
) change and observe the
behavior of the output voltage, V
OUT1
(V
OUT2
for Channel 2),
with an oscilloscope.
Load Transient Response
Generate a load current transient at the output, V
OUT1
(V
OUT2
for
Channel 2), and observe the output voltage response with an
oscilloscope. Use a current probe attached to the wire between
the output and the load to visualize the current transient.
MODIFYING THE BOARD
To modify the converter configuration, unsolder and/or
replace/remove the appropriate passive components or links
on the board.
Changing the Operation Mode Settings
The operating mode of the ADP2114 dc-to-dc converter can
be changed by replacing the configuration resistor, R14, with a
different value, as shown in Table 1. This configuration sets the
current limit for each channel and enables or disables the transi-
tion to pulse skip mode at light loads.
Table 1. Setting the Operating Mode
R14 (Ω) ± 5%
Maximum DC Load Current (A) Peak Current Limit (A)
Pulse Skip V
OUT1
V
OUT2
V
OUT1
V
OUT2
0 2 2 3.3 3.3 Enabled
4.7 k 2 2 3.3 3.3 Forced PWM
8.2 k 3 1 4.5 1.9 Enabled
15 k 3 1 4.5 1.9 Forced PWM